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We describe the existence of two Echinodorus tennellus cytotypes, with diploid populations, of 2n=22 chromosomes, and triploid ones, with 2n=33. Meiotic studies showed abnormalities and 50% pollen stainability in plants of triploid populations, but 100% pollen stainability in a diploid population. Data from C-banding and CMA/DAPI (Chromomycin A 3 /4,6-diamidino-2-phenylindole) fluorescent...